// todo need optimize like in event.jsp. Add indexing or not indexing this page. Leavitt did volunteer work at Harvard College Observatory (2 ene 1893 año – 14 ene 1902 año) (Cinta de tiempo)
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Leavitt did volunteer work at Harvard College Observatory (2 ene 1893 año – 14 ene 1902 año)

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big history project timeline

ByAlia
23 ene 2018

fecha:

2 ene 1893 año
14 ene 1902 año
~ 9 years
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